All the Perl that's Practical to Extract and Report

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Indeed, and if I'd have found it I would have been pleased to use it. Even as I wrote it I had this sneaking feeling [netthink.co.uk] that the wheel already existed, though I didn't think to look in the Set:: namespace. This probably reflects more on my not paying attention in maths class than to anything else.

Anyway, I'm glad you gained something from my version, sorry for the toe-trampling.